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Service B on Mercedes E Class
Regular maintenance is vital to keeping your Mercedes-Benz E-Class reliable and smooth. One of the most important milestones in the Flexible Service System (FSS) is Service B, typically required every 20,000 miles or 2 years.
Unlike Service A, which is more basic, Service B includes comprehensive checks and fluid replacements that protect your car’s performance and longevity. Whether you plan to handle small tasks yourself or rely on certified Mercedes-Benz technicians, understanding what’s included helps you stay in control of your car’s care.
For a broader look at service intervals and maintenance schedules, see our Mercedes Maintenance and Service Guide.
What Is Service B on Mercedes E-Class?
Service B is a scheduled maintenance interval performed at:
- – 20,000 miles or 2 years after Service A
- – Repeated every 20,000 miles / 2 years thereafter
It’s more detailed than Service A and includes several key inspections, fluid exchanges, and filter replacements.
What’s Included in Service B?
| Task | Details |
|---|---|
| Synthetic Motor Oil Replacement | Genuine MB-approved synthetic oil |
| Oil Filter Replacement | Ensures clean oil circulation |
| Cabin Air Filter Replacement | Improves cabin air quality & HVAC efficiency |
| Brake Fluid Exchange | Replaced with DOT 4 Plus to maintain brake safety |
| Engine Air Filter Replacement | Keeps airflow clean for optimal combustion |
| Fluid Level Checks & Top-Ups | Brake, coolant, steering, washer |
| Tire Inflation & Brake Inspection | Pressure check + brake pad/rotor inspection |
| Reset Maintenance Counter | Updates service schedule in onboard system |
| Multi-Point Inspection | Checks across engine, suspension, electronics |
Variations: B1, B2, B3 and Beyond
Like Service A, Service B has variations (B1–B7) depending on vehicle age, mileage, and regional requirements.
- – B1: Standard Service B + basic inspection + tire rotation
- – B2: Adds transmission fluid service, suspension inspection
- – B3: Adds spark plugs, coolant flush, battery check, fuel system inspection
- – B4+: May include belts, suspension, exhaust system, timing components, or advanced diagnostics
Why Service B Matters
- – Performance: Fresh fluids, filters, and plugs ensure smooth driving.
- – Safety: Brake fluid flush and brake inspection maintain stopping power.
- – Longevity: Prevents premature wear on critical systems.
- – Resale Value: Complete service records boost buyer confidence.
Cost of Service B on Mercedes E-Class
- – Average Range: $400–$600
- – Factors Affecting Price: Location, dealership vs independent shop, additional tasks (e.g., spark plugs, suspension checks).
Tip: Independent Mercedes-Benz specialists often provide OEM service at lower costs than dealerships.
How to brake fluid change ?
Brake Fluid Change Instructions
1: Remove: Detach the cover (5) located above the brake fluid reservoir (6).
2: Clean: Clean around the cap of the brake fluid reservoir (6).
3: Unscrew: Remove the cap from the brake fluid reservoir (6).
4: Purge: Pour new brake fluid up to the “Max” mark in the brake fluid reservoir (6) using “Brake Fluid (DOT 4 plus)”.
5: Remove Front Wheels: Take off the front wheels.
6: Connect Filling Device: Attach the filling device to the brake fluid reservoir (6).
7: Activate Filling Device: Turn on the filling device.
8: Lift Vehicle: Raise the vehicle.
9: Perform Purge: Proceed with the brake fluid purge.
10: Reinstall Front Wheels: Put the front wheels back on.
11: Check: Lower the vehicle.
12: Deactivate Filling Device: Turn off the filling device and disconnect it from the brake fluid reservoir (6).
13: Check for Leaks: Inspect the brake system for leaks.
14: Adjust Fluid Level: Correct the fluid level in the brake fluid reservoir (6).
15: Reinstall Cap: Close the brake fluid reservoir (6) with the cap.
16: Replace Cover: Place the cover back above the brake fluid reservoir (6).
How to cabin air filter replacement ?
To replace the cabin air filter, follow the next steps;
Remove
- 1. Unlock the latches (2) and remove the rear right engine compartment cover (1).
- 2. Unhook the support (A) and support (B) from the air guide segment (4) and remove the air guide segment (4).
- 3. Remove the dust filter (3) from the air guide segment (4).
Clean
- 4. Clean the inside of the air guide segment (4).
Install
- 5. Insert the new dust filter (3) into the air guide segment (4).
- 6. Install the air guide segment (4).
- 7. Hook the support (A) and support (B).
- 8. Install the rear right engine compartment cover (1) and lock the latches (2).
Engine air filter change Procedure
To change the engine air filter in the Mercedes E Class equipped with a V6 M276 gasoline engine, follow the following steps;
Remove and Install Instructions
1: Open the engine hood.
2: Remove the engine cover.
3: Remove the right (1) or left (4) engine air intake duct.
4: Disconnect the electrical connector from the pressure sensor after the air filter (B28/5) or the pressure sensor connector after the air filter for the left cylinder bank (B28/4).
5: Unscrew the screw (6) and disconnect the filtered air duct (5) from the turbocharger intake flange.
6: Remove the right (2) or left (3) air filter housing from the mounts by pulling it upwards.
7: Disconnect the filtered air duct (5) from the right (2) or left (3) air filter housing.
Service B on Mercedes E Class is a critical maintenance interval for your Mercedes, ensuring that your vehicle continues to perform at its best. By adhering to the recommended service intervals and having your vehicle serviced by certified technicians using genuine parts, you can enjoy peace of mind knowing that your E-Class is in top condition.
DIY vs Dealer/Independent Garage
| Task | DIY Possible? | Recommended |
|---|---|---|
| Oil & filter change | Yes | DIY or specialist |
| Cabin air filter | Yes | DIY |
| Brake fluid flush | Moderate (needs tools) | Dealer or specialist |
| Engine air filter | Possible (requires care) | Specialist recommended |
| Transmission service | No | Dealer or certified shop |
FAQs
Q: How often should Service B be done on an E-Class?
Every 20,000 miles or 2 years, alternating with Service A.
Q: What’s the difference between Service A and B?
Service B includes everything from Service A plus brake fluid exchange, cabin filter, and deeper inspections.
Q: Can I skip Service B if I do Service A?
No, Service B addresses items not included in Service A. Skipping it risks safety and warranty coverage.
Q: How long does Service B take?
Usually 2–3 hours, depending on add-ons.
Q: Is Service B expensive?
Expect $400–$600. Costs rise if spark plugs, coolant, or transmission fluid are due.
Conclusion
Service B on the Mercedes E-Class is a crucial maintenance milestone, ensuring your vehicle’s performance, safety, and longevity. With tasks ranging from fluid replacements to multi-point inspections, Service B goes beyond the basics of Service A. By keeping up with this schedule, you’ll enjoy reliable driving and protect the value of your E-Class for years to come.
Author Bio
Written by Mercedes Expert
With years of hands-on experience diagnosing and repairing Mercedes-Benz systems, he brings technical depth and practical case studies to help car owners, technicians, and enthusiasts troubleshoot complex automotive issues. His work focuses on clear repair guides, OEM-level procedures, and knowledge-sharing to empower both professionals and drivers.
Last update: September 2025
